Relegation threatened Cologne believe they have a chance to hand Bayer Leverkusen a first season defeat in their Rhine area Bundesliga derby on Sunday. Leverkusen come to third bottom Cologne with a German top flight team record of 33 games without defeat in all competitions. They lead the Bundesliga by eight points, are in the German Cup semi-finals and in the Europa League last 16. But Cologne first team chief Thomas Kessler said on Friday that “it is possible that we are the first” to beat them, because “every team loses at some stage.” Coach Timo Schultz admitted that “it is a challenge to…